Elastic eluidtttrbini



May 26, 1931, c. A. PARSONS ET AL 1,805,545

' ELASTIC FLUID TURBINE Filed 001;. 12. 19 7 llll llll v Ill Hllnmmm IIHIIIHIHII Patented May 1 26, 1931 Y SAID PARSONS ELASTIC FLUID ,TIIRIBIIIIII i y Application 'filed October 12, 1927, SerialNo..2t35,7 27,;andjinGreat. iar'itaihiir ve br'is; 1926.

The invention relates to elastic-fluidturbines or turbine units of thegkind designed to and main reaction blading, (Z, are carried on operate efliciently over a considerable range of power, the object of the present invention beingto-provide an improved form'of such a unit.

With such an object The invention consists in an elastic-fluidturbine unit comprising the combination of elements hereinafter described and particularly pointed out in theclaims.

The accompanying drawing shows in sectional elevation an illustrative structural embodiment of the invention.

In carrying the invention into eflect according to this form, the cruising impulse blading, a, and cruising reaction blading, 6, together with the main impulse blading, c,

a single rotor, A, in the-sequence set forth. A regulating valve, B, is provided for admitting live'steam direct to the nozzles of the cruising impulse stage while a main regulating valve, C, admits live steam to the nozzles'of the main impulse stage. Further, a by-pass, D, connects the exhaust side of the cruising impulse blading, a, to the. exhaust 7 side of the main impulse blading, 0, this by-pass being, controlled by a suitable Valve,E

In addition, steam can by-pass the main impulse blading, 0, through apertures, f, in the impulse-wheel disc, h. i 1

The turbine unit above ated as follows I e V At full power the. cruising regulating valve, B, is closed and the mainregulating valve, C, opened, steam thus passing through the main impulseand reaction blading, c and d, whilethe cruising impulse and reaction blading, a and b, rotates idly in steam at the pressure of the main impulse stage exhaust. Preferably the by-pass valve, E, in these circumstances is opened so that the low-pressure steam may circulate freely through the cruising blading, a, b. i 7

At intermediate powers the" main regulating valve, G, is closed andthe b pass, E,

described is operand'cruising regulating valves, opened. Steam then passes through the cruising im- ')ii1se" b1ading,1a, through the la as, D, to the main reaction blading, d, thereby shortcircuiting both the cruising reaction blading, '6, andthe main impulse blading, c. In

this case the idle partsrotate in steam at the 3 pressure ofthe cruising impulse stage ex aust.

UNITED STATES CHARLES ALGEBNON AnsoNs, or NEwcAsrLEfroN irxNE, ENG A n, A D En 'Esr HE RY BUCHANAN ANDERSON, OF NEW onx, in; sail) ANDERSON AssIGNon 'ro Finally at cruising powersthe by-pasgEp i andmainregulating valves, 6, arefclosed and the cruising regulating valve, B, opened. Steam now passes through the Icruising'impulse and reaction blading,a and; I), by-passe s the mainimpulse'bladingfc, (for example,

by'hjth v i ap rt and continues through the main reaction blading d. Simi lady in this case the idle stage, namely] the main impulse blading; rotates in Samar,

a low pressure. V H

In the structural form of the invention above described it will be seen that there are no diaphragms or internal packings while the windage losses are in all cases small due to the fact that the idle parts are rotating in steam which has been expanded to a low pressure. 7

The detailed structural embodiment of the invention may take other forms than those described above. 1

Having now described our invention, what we claim as new and desire to secure. by let-' -ters Patent 1s v 1. An elastic-fluid turbine unit comprising in combinatlon a rotor; a stator casing surrounding said rotor to provide a continuous annular passage available for flow of motive fluid and disposed insaid passage inthe sequence set forth, cruising impulse and' re- Y action blading and main impulse and reac-- tion bla'ding; and means for by-passing motive fluid from'a point of said passage be tween said cruising impulse and reaction blading to a point of said passage between said main impulse and reaction blading;

2. An elastic-fluid turbine unit comprising in combination a rotor} a stator casing surrounding said rotor to provide a continuous annular passage avallable V for flow of motive fluid and disposed in said passage in thesequence set forth, cruising impulse and reaction blading and main impulse entireno" I action blading; and means for by-passing motive fluid from said cruising reaction to said main reaction blading.

3. An elastic-fluid turbine unit comprising in combination a rotor; a stator casing surrounding said rotor to provide a continuous annular passage available for flow of motive fluid and disposed in said passage in the sequence set forth, cruising impulse and reaction blading and main impulse and reaction blading; and means mounted on said rotor and carrying said main impulse blading,

said carrying means being perforated to permit motive fluid to by-pass from said cruising reaction to said main reaction blading.

4. An elastic-fluid turbine unit comprising in combination a rotor; a stator casing surrounding said rotor to provide a continuous annular passage available for flow of motive fluid and disposed in said passage in the sequence set forth, cruising impulse and reaction blading and main impulse and reaction blading; independent supplies of motive fluid to said cruising impulse and to said main impulse blading; and independent means for by-passing exhaust motive fluid to said main reaction blading from both said cruising impulse and said cruising reaction blading.

In testimony whereof We have signed our names to this specification.

CHARLES ALGERNON PARSONS. ERNEST H. B. ANDERSON. 

